1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e9a1f7c69accb9c333485a67b32639b382658412493b8dce2a2bf66958e50b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f34f904-1ddb-4031-b8eb-d5e50f5c8c80.json and https://artists.proofprofile.net/proofs/artist/5f34f904-1ddb-4031-b8eb-d5e50f5c8c80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f77e4e09a8c9ec0a8a8a1133555a122e6b6376d3e50d1d7738806af4d7fd00e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2305beb1c6d0f1a8cddc1e76dcc9faf8df4a7b2481752b55cf596ab678a3492. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0de7f6b611c85f1887c8433e420507c8e20b0da2f5656a22b4d240ee8523f2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8c35ed8486b27167a25d6bc8500e3d527bfa2186915476dabd6ab715deee8e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c78829a336c34fa2743f88243e3d624c9f40796ffa3d6b062a88a97b1eed2f. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b124bc86040b27fa802092a9b2ba1bc06653944a80a4cb7baa0755366477a3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb718675fa630639606b54d18d8215b6d5ccd854b1bcd55c031b4b49d74c7e28. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f621d0064341ed3bf6915519a4b210b29cc99599baef99ca1305f6dd20057b3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63d38bf79206c77d218e9fc1a2d48ab6341c84143dd24a635bbc5ba560452fd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9080dbc1fbb90d1484de1db29406fd05fbbf4aaf1c357ec07948df703f83d0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7579fa09307d11bd374d35d54a601bf0958e3ec23685ed3377cea3ff409082e8. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c75b29b86db920ecac8a6bd4577d4ac63df95d4c0d8b4e12e608fef7a445e1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a24cbf6ba412e56adb56ae45dc2770b7694e103cf008c789f7a63e7045d04e6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEJ1910683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafb577791bd47aac3f0458f2d0f9134260f1319878343fc9d7a7e8a33c731f2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEN1922828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57c25a53e162e11345e32986d8543b0f521ea5898c58f21a6c961ddda1faa05. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAED1904944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e93388076dde94d33d51ee2ebd5b9d79ed063fbbde8276b91b6232bcef4f4b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEA1975902.